Silencer for internal-combustion engines



June 26, 1923. 1,459,797

c. PAROLlNl ET AL 'SILENCER FOR INTERNAL COMBUSTION ENGINES Filed Aug.16, 1921 Inventor; .gy

Patented June 26, 1923.

UNITED STATES PATENT OFFICE.

SILENCER FOR INTERNAL-COMBUSTION ENGINES.

Application filed August 16, 1921. Serial No. 492,788.

To all whom it may concern:

Be it known that .we, CESARE PAROLINI and GUsT'Avn PERRON, both citizensof the French Republic, residin at Paris, in the Department of Seine andepublic of France, have invented certain new and useful Improvements inSilencers for Internal-Comustion Engines (for which patents have beenfiled as follows: France, No. 499,519, July 24, 1918; Germany (pending),filed October 28, 1919; England, No. 134,844, November 4, 1919; Belgium,No. 286,434, April 29, 1920' Switzerland, No. 89,859, April 30, 1920;.IIolland, No. 6,741, May 19,1920; Spain, No. 73,835, May 26, 1920;Italy, No. 145,530, June 30, 1920), of which the 01- lowin is a full,clear, and exact description.

This invention has'for its object to provide an improved silencer whichwill do away entirely with the .noise of the exhaust of internalcombustion en ines.

The im roved silencer has also the advantage o being very light and ofnot takin too much power from the engine.

e improved silencer is characterized essentially by the combination of alarge exinner casi rli g engine.

pansion chamber having verythin walls, ar ranged concentrically inside asecond chamber of larger diameter.

In the'space left between the two chamhers a vacuum is established forpreventing the transmission of the vibrations of the walls ofth e innerchamber into which latter the exhaust gases of the engine expand. Theaccompanying drawing illustrates by way of example a constructional formof the improved silencer in longitudinal section.

As shown, 1 and 1' aretwo inner casings of rather large capacityconstructed of very thin metal.

2 and 2' are two outer casin'gs surroundthe casings 1 and 1'respectively.

3 is the 'pipeconnecting the engine to the '1; A being the end nearestthe e other end B of the iple is closed, and its sides are pierced witoles 7 that allow the exhaust gases to escape into the chamber 8 of theinner casing 1. 1

ipe 3' connects the chamber 8 with the mg into chamber 9;

4 is the final exhaust pipe. 6 and '5' are cocks communicating with r9jof the inner oasin 1, the end A opening into chamber 8 and t e end Bopenthe outer spaces 6 and 6; they serve for producing a vacuum in thesaid spaces.

The operation of the improved silencer is as follows The gasesexhausting from the en ine cylinders are led by the pipe 3 into theinner chamber 8.

In this chamber the gases expand and pass through the pipe 3 into theinner chamber 9 of the second outer casing 1 wherein they expand again.

After this they pass out through the pigs 4.

0 do away with the noise caused by the Vibration of the walls ofthecasings, a vacuum is formed in the outer spaces 6 and 6', whereby theexhaust is completely silenced.

The lmproved silencer does nottake any power from the engine, becausethe gases do not have to flow through circuitous passages in' order toescape into the atmosphere. Moreover, the improved silencer can be madevery light because it can be constructed of very thin metal plates.

It is to be understood that the invention is not strictly limited to thedetails as described, and that the forms, proportions, dimensions,arrangements and materials may be modified at will as may be considerednecessary to satisfy the requirements of practice, without .departingfrom the natureof the invention as herein described.

What we claim is:

1, A silencer for the exhaust of internal combustion engines,characterized by the arrangement of one or more large chambers whereinthe exhaust gases are allowed to ex pand, said chambers beingconstructed with double walls comprising between them a space in whichavacuum is produced.

2. A silencer for explosion engines comprising a casing havin thereinan. expan-'- In testimony whereof, we afiix. oursignatures in presenceof two witnesses.

. GUSTAVE PERRON.

CESARE PAROLINI.

Witnesses:

Cams Dmznr, Camus

